Dataset: MOCNESS_tabs_PS24
Deployment: ANT-XXIV_1

MOCNESS Summary Data from Polarstern Cruise PS24-1 (ANTXXIV/I)

Principal Investigator:

Peter H. Wiebe (Woods Hole Oceanographic Institution, WHOI)

Project:

Census of Marine Zooplankton-2004-2010 (CMarZ_2004-2010)

Current State:

Final no updates expected

Deployment Synonyms:

PS24_1

Version Date:

2010-11-19

Data URL:

https://www.bco-dmo.org/dataset-deployment/452943/data

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Description

Summary of environmental data collected by the MOCNESS systems' (1 and 10 meter-square) electronics packages.

Methods & Sampling

Dataset acquisition description

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown CMarZ_2004-2010 Sloan	Alfred P. Sloan Foundation

Instruments

MOCNESS1

Supplied Description:

335 micron mesh, 9 nets

Instrument Type

Generic Name: MOCNESS1

Acronym: MOC1

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. The MOCNESS-1 carries nine 1-m2 nets usually of 335 micrometer mesh and is intended for use with the macrozooplankton. All nets are black to reduce contrast with the background. A motor/toggle release assembly is mounted on the top portion of the frame and stainless steel cables with swaged fittings are used to attach the net bar to the toggle release. A stepping motor in a pressure compensated case filled with oil turns the escapement crankshaft of the toggle release which sequentially releases the nets to an open then closed position on command from the surface. -- from the MOCNESS Operations Manual (1999 + 2003).

MOCNESS10

Supplied Description:

5 nets, 335 micron mesh

Instrument Type

Generic Name: MOCNESS10

Acronym: MOC10

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) is based on the Tucker Trawl principle (Tucker, 1951). The MOCNESS-10 (with 10 m^2 nets) carries 6 nets of 3.0-mm circular mesh which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). In this system, "the underwater unit sends a data frame, comprising temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds" (Wiebe et al., 1985).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
tow	tow number		tow
lat_start	latitude start of MOCNESS cast, negative = South	DD.D	lat_start
lon_start	longitude start of MOCNESS cast, negative = West	DDD.D	lon_start
depth_w	depth of water, seafloor depth from the shipboard 12kHz Knudsen echosounder; seafloor in eventlog	meters	depth_w
net	MOCNESS net number, (0-8)		net
yrday_local	year day as a decimal, based on Julian calendar, local time	YYY.Y	yrday_local
num_obs	number of observations		numb_obs
vol_filt	volume filtered	meters^3	vol_filt
press	depth of observation or sample	meters	press
temp	temperature of water	degrees C	temp
potemp	potential temperature or theta	degrees C	potemp
sal	salinity calculated from conductivity		sal
sigma_0	potential density	kg/m^3	sigma_0
angle	angle of net frame relative to vertical (0-89 degrees)	degrees	tow_angle
hzvel	horizontal net velocity	m/min	hzvel
vtvel	vertical net velocity	m/min	vtvel

Database

Contribute Data

Dataset: MOCNESS_tabs_PS24
Deployment: ANT-XXIV_1

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: MOCNESS_tabs_PS24Deployment: ANT-XXIV_1

Dataset acquisition description

Dataset Processing Description

Dataset: MOCNESS_tabs_PS24
Deployment: ANT-XXIV_1